Well the CRONS are installed via product XML file.
- you can import the vBGallery product again. (select overwrite) this should clean up things, if there are problems.
In the download of the gallery script
Log-in to your AdminCP
- Plugins & Products -> Manage Products -> [Add/Import Product]
[Browse] - forums/admin/product-ppvbgallery.xml
Allow Overwrite [ x ] Yes